Full-Range Soft-Switching-Isolated Buck-Boost Converters With Integrated Interleaved Boost Converter and Phase-Shifted Control
Abstract— Full-Range Soft-Switching-Isolated Buck-Boost Converters With Integrated Interleaved Boost Converter and Phase-Shifted Control. A new method for deriving isolated buck-boost < Final Year Projects 2016 > IBB converter with single-stage power conversion is proposed in this paper and novel IBB converters based on high-frequency bridge less inter leaved boost rectiﬁers are presented. The semiconductors, conduction losses, and switching losses are reduced signiﬁcantly by integrating the interleaved boost converters into the full-bridge diode-rectiﬁer. Various high-frequency bridgeless boost rectiﬁers are harvested based on different types of interleaved boost converters, including the conventional boost converter and high step-up boost converters with voltage multiplier and coupled inductor. The full-bridge IBB converter with voltage multiplier is analyzed in detail. The voltage multiplier helps to enhance the voltage gain and reduce the voltage stresses of the semiconductors in the rectiﬁcation circuit. Hence, a transformer with reduced turns ratio and parasitic parameters, and low-voltage rated MOSFETs and diodes with better switching and conduction performances can be applied to improve the efﬁciency. Moreover, optimized phase-shift modulation strategy is applied to the full-bridge IBB converter to achieve isolated buck and boost conversion. What’s more, soft-switching performance of all of the active switches and diodes within the whole operating range is achieved. A 380-V output prototype is fabricated to verify the effectiveness of the proposed IBB converters and its control strategies.
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